weighting_fct: Weigthing function for selected features
In SurvRank: Rank Based Survival Modelling

Weigthing function for selected features, according to the performance in the outer loop

1	weighting_fct(out.mat, t.times, cv.out, out.sc, n1)

`out.mat`	matrix of dimension t.times*folds times features according to training set selections. 0/1 matrix: 1 (0) if the feature was (not) selected in the run
`t.times`	number of times the cross-validation should be repeated
`cv.out`	number of folds in outer cross validation loop (for estimation of the predictive accuracy)
`out.sc`	matrix of t.times (of repeated cross validation) times folds (number of outer CV folds) of prediction accuracy evaluations
`n1`	parameter for functions of two different weighting functions. Deviation from average performance leading to double weight of selected coefficients.